Density irregularities, thermal differences-all these fluctuations, on geological time scales contribute to the rate of mountain formation and tectonic activity.
12.
In 1960, using the findings of radiometric dating, he published a geological time scale estimating the age of each geological era.
13.
In 1841 John Phillips published the first global geological time scale based on the types of fossils found in each era.
14.
The present system of rivers seems to date from around five million years ago, not long ago on a geological time scale.
15.
:Stratified oceans and deep water anoxia / euxinia are well known occurences over geological time scales ( many millions of years ).
16.
The process, he said, is part of a natural cycle in which ice shelves grow and then calve icebergs over geological time scales.
17.
That might not sound like much, until you put it into a geological time scale of tens or hundreds of millions of years.
18.
Biological evolution works on a nearly geological time scale, which suggests that human nature, as a partial product of our genes, is basically constant.
19.
Nevertheless, at least one notable scientific work has advocated using the lunar geological time scale to subdivide the Hadean eon of Earth's geologic time scale.
20.
This apparent stability is not real over even quite short geological time scales, but it is real enough over the short life of an organism.
